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July 27th, 2026 :: 10:41 pm CDT   

Local Weather Report for
Decatur
Illinois, United States

 Current Decatur Weather Conditions Updated July 27th at 9:54 pm 
Temperature:81°F Dew Point:75°F
Barometer:29.74 inHg Wind:N 11 Mph
Humidity:83.7% Visibility:0M
 
 Decatur Weather Forecast Summary  
 
Today
Jul 27th
Tuesday
Jul 28th
Wednesday
Jul 29th
Thursday
Jul 30th
Friday
Jul 31st
Mostly Sunny Mostly Sunny Mostly Sunny Mostly Sunny Mostly Cloudy
91°F
82°F
69°F
80°F
60°F
81°F
64°F
72°F
67°F
 
 Decatur Detailed Weather Forecast  
 
Tuesday, July 28th, 2026
Overnight Temperature: 70°F
Mostly clear with a chance of showers. Windy at times.
Morning Temperature: 75°F
Sunny with cloudy periods. Slight chance of a thunderstorm. Windy at times.
Afternoon Temperature: 82°F
Sunny with cloudy periods. Chance of a thunderstorm. Windy at times.
Evening Temperature: 74°F
Clear. Chance of a thunderstorm.
Wednesday, July 29th, 2026
Overnight Temperature: 62°F
Clear.
Morning Temperature: 67°F
Sunny. Windy at times.
Afternoon Temperature: 79°F
Mostly sunny. Windy at times.
Evening Temperature: 72°F
Clear. Slight chance of a thunderstorm.
Thursday, July 30th, 2026
Overnight Temperature: 65°F
Clear.
Morning Temperature: 71°F
Mostly sunny.
Afternoon Temperature: 81°F
Mostly sunny.
Evening Temperature: 75°F
A mix of clear and cloudy skies. Chance of a thunderstorm.
Friday, July 31st, 2026
Overnight Temperature: 71°F
A mix of cloudy and clear skies.
Morning Temperature: 69°F
Cloudy.
Afternoon Temperature: 67°F
Cloudy with a chance of showers.
Evening Temperature: 67°F
Cloudy with clear periods with a chance of showers. Windy at times.
Saturday, August 1st, 2026
Overnight Temperature: 65°F
Cloudy with a chance of showers. Windy at times.
Morning Temperature: 64°F
Cloudy with a chance of showers. Windy at times.
Afternoon Temperature: 71°F
A mix of sun and cloud with a slight chance of showers. Windy at times.
Evening Temperature: 66°F
Mostly clear. Windy at times.
Sunday, August 2nd, 2026
Overnight Temperature: 62°F
Clear.
Morning Temperature: 68°F
Sunny. Windy at times.
Afternoon Temperature: 80°F
Sunny. Chance of a thunderstorm. Windy at times.
Evening Temperature: 72°F
Clear. Chance of a thunderstorm.
Monday, August 3rd, 2026
Overnight Temperature: 66°F
Clear.
Morning Temperature: 70°F
Sunny.
Afternoon Temperature: 81°F
Sunny. Slight chance of a thunderstorm.
Evening Temperature: 73°F
Clear. Chance of a thunderstorm.
Tuesday, August 4th, 2026
Overnight Temperature: 67°F
Clear.
Morning Temperature: 73°F
Sunny. Slight chance of a thunderstorm.
Afternoon Temperature: 84°F
Mostly sunny. Chance of a thunderstorm.
Evening Temperature: 78°F
Clear with a slight chance of showers or thundershowers.





 

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This WeatherCity Weather Forecast for Decatur, Illinois, United States is computed using a computer-generated forecast model and should be considered experimental. Please confirm this weather information with your official weather information office

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